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Dopamine - The dopamine reward circuit and feeding behaviour

Your Brain in Love

The dopamine reward circuit and feeding behaviour

نویسنده :Alireza Moayedi
تاریخ:شنبه 12 مهر 1393-10:20 ق.ظ

 With respect to feeding behaviour, rodents lacking dopamine in their nerve fibers (through a genetic approach which selective eliminates tyrosine hydroxylase, an enzyme needed for dopamine synthesis) die of starvation or dehydration (as a consequence of “aphagia” and “adipsia”). In light of the dopamine hypothesis, this could be explained by a lack of “motivation” to respond to the presence of food and water; the animal no longer shows goal-directed behaviour because it does not anticipate a reward. In a similar fashion, bilateral ablation of dopamine neurons (using 6-hydroxydopamine), in particular those emanating from the substantia nigra (SN) and projecting to the caudate nucleus and the putamen (components of the “nigrostriatal system”, see figure 3), also resulted in starvation. But these are just a few examples of a long list of studies in which the role of dopamine has been studied (reviewed by Fulton S and by Palmiter RD). The literature is difficult to summarize because each study focuses on a different brain area, using a different tool and observing different effects on behaviour ranging from “taste reactivity”, “free-feeding intake”, “goal-directed behaviour”, “assessing environmental cues” or “learning of taste aversion”. However, there seems to be general agreement that dopamine is important to acquire information about rewards (which cues, which stimuli & storing information) and the behavioral responses to obtain them (goal-directed behaviour, dopamine strengthens action-outcome associations). It seems not to be involved in the events related to the consummatory phase of feeding.




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